import type { FastifyPluginAsync } from 'fastify'
import { repos } from '@evofw/db'
import {
  createIpListBodySchema,
  listEntriesBodySchema,
  deleteListEntryBodySchema,
  isManualListType,
  listEntryInputSchema,
  listImportQuerySchema,
  listDetailPageQuerySchema,
} from '@evofw/shared'
import { AppError } from '../plugins/error-handler.js'
import { refreshIpList } from '../services/lists/refresh.js'
import {
  addListEntries,
  addListEntriesSummary,
  deleteListEntry,
  deleteListEntrySummary,
  mapListDetail,
  mapListDetailPage,
} from '../services/lists/entries.js'
import type { AppConfig } from '../config.js'
import { auditMutation } from '../services/audit.js'
import { maskListConfig, sealListConfig } from '../services/secret-cipher.js'
import { applyPagination } from '../services/pagination.js'

const LIST_IMPORT_BODY_LIMIT = 8 * 1024 * 1024
const MAX_IMPORT_ENTRIES = 100_000
function validateImportBudget(values: string[], structuredCount = 0) {
  let count = structuredCount
  if (count > MAX_IMPORT_ENTRIES) throw new AppError('VALIDATION_ERROR', 'At most 100000 list entries per import', 400)
  for (const value of values) for (const _token of value.matchAll(/[^\n,;\s]+/g)) {
    if (++count > MAX_IMPORT_ENTRIES) throw new AppError('VALIDATION_ERROR', 'At most 100000 list entries per import', 400)
  }
}

export const listsRoutes: FastifyPluginAsync<{ config: AppConfig }> = async (
  app,
  opts,
) => {
  const { config } = opts

  app.get<{ Querystring: { limit?: string; offset?: string; view?: string } }>(
    '/lists',
    async (req) => {
      if (req.query.view !== undefined && req.query.view !== 'summary') throw new AppError('VALIDATION_ERROR', 'Unknown list catalog view', 400)
      const lists = req.query.view === 'summary' ? repos.listIpListsSummary(app.db) : repos.listIpLists(app.db)
      const counts = repos.countEntriesByListIds(
        app.db,
        lists.map((l) => l.id),
      )
      const items = lists.map((l) => ({
        id: l.id,
        name: l.name,
        type: l.type,
        config_json: 'configJson' in l && typeof l.configJson === 'string' ? maskListConfig(l.configJson) : '{}',
        content_hash: l.contentHash,
        refreshed_at: l.refreshedAt,
        last_error: l.lastError,
        entry_count: counts.get(l.id) ?? 0,
        created_at: l.createdAt,
        updated_at: l.updatedAt,
      }))
      const paged = applyPagination(items, req.query)
      return { items: paged.items, total: paged.total }
    },
  )

  app.post('/lists', { bodyLimit: LIST_IMPORT_BODY_LIMIT }, async (req) => {
    const body = createIpListBodySchema.parse(req.body)
    const type =
      body.type === 'domains' ? 'static' : body.type
    const inputConfig = { ...(body.config ?? {}) }
    validateImportBudget(body.entries ?? [], (Array.isArray(inputConfig.items) ? inputConfig.items.length : 0) + (Array.isArray(inputConfig.domains) ? inputConfig.domains.length : 0))
    if (isManualListType(type) && ((inputConfig.items !== undefined && !Array.isArray(inputConfig.items)) || (inputConfig.domains !== undefined && !Array.isArray(inputConfig.domains)))) {
      throw new AppError('VALIDATION_ERROR', 'Manual list items/domains must be arrays', 400)
    }
    const initialItems = isManualListType(type) && Array.isArray(inputConfig.items)
      ? inputConfig.items.map((item) => listEntryInputSchema.parse(item))
      : []
    const initialDomains = isManualListType(type) && Array.isArray(inputConfig.domains)
      ? inputConfig.domains.map((domain) => listEntryInputSchema.parse({ kind: 'hostname', value: domain }))
      : []
    if (isManualListType(type)) {
      delete inputConfig.items
      delete inputConfig.domains
    }
    const id = crypto.randomUUID()
    const list = repos.insertIpList(app.db, {
      id,
      name: body.name,
      type,
      configJson: sealListConfig(inputConfig),
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString(),
    })
    if (isManualListType(type) && (body.entries?.length || initialItems.length || initialDomains.length)) {
      try {
        await addListEntries(app.db, id, { values: body.entries, items: [...initialItems, ...initialDomains] })
      } catch (err) {
        repos.deleteIpList(app.db, id)
        throw new AppError(
          'VALIDATION_ERROR',
          err instanceof Error ? err.message : String(err),
          400,
        )
      }
    } else if (!isManualListType(type)) {
      await refreshIpList(app.db, id)
    }
    auditMutation(app, config, req, {
      action: 'list.create',
      targetType: 'app_resource',
      targetId: list!.id,
      summary: `Создан список: ${list!.name}`,
      details: { list_id: list!.id, type: list!.type },
    })
    return {
      id: list!.id,
      name: list!.name,
      type: list!.type,
      config_json: maskListConfig(list!.configJson),
      created_at: list!.createdAt,
      updated_at: list!.updatedAt,
    }
  })

  app.get<{ Params: { id: string } }>('/lists/:id', async (req) => {
    const detail = Object.keys(req.query as object).length > 0
      ? mapListDetailPage(app.db, req.params.id, listDetailPageQuerySchema.parse(req.query))
      : mapListDetail(app.db, req.params.id)
    if (!detail) throw new AppError('NOT_FOUND', 'List not found', 404)
    return detail
  })

  app.post<{ Params: { id: string } }>(
    '/lists/:id/entries',
    { bodyLimit: LIST_IMPORT_BODY_LIMIT },
    async (req) => {
      const l = repos.getIpList(app.db, req.params.id)
      if (!l) throw new AppError('NOT_FOUND', 'List not found', 404)
      const body = listEntriesBodySchema.parse(req.body)
      const summary = listImportQuerySchema.parse(req.query).return === 'summary'
      validateImportBudget(body.values ?? [], body.items?.length ?? 0)
      try {
        const input = { values: body.values, items: body.items }
        const result = summary ? await addListEntriesSummary(app.db, l.id, input) : await addListEntries(app.db, l.id, input)
        auditMutation(app, config, req, {
          action: 'list.entries.add',
          targetType: 'app_resource',
          targetId: l.id,
          summary: `Добавлены записи в список: ${l.name}`,
          details: {
            list_id: l.id,
            entry_count: 'count' in result ? result.count : result.entries.length,
          },
        })
        return summary ? result : mapListDetail(app.db, l.id) ?? result
      } catch (err) {
        throw new AppError(
          'VALIDATION_ERROR',
          err instanceof Error ? err.message : String(err),
          400,
        )
      }
    },
  )

  app.delete<{ Params: { id: string } }>(
    '/lists/:id/entries',
    async (req) => {
      const l = repos.getIpList(app.db, req.params.id)
      if (!l) throw new AppError('NOT_FOUND', 'List not found', 404)
      const body = deleteListEntryBodySchema.parse(req.body)
      const summary = listImportQuerySchema.parse(req.query).return === 'summary'
      try {
        const result = summary ? await deleteListEntrySummary(app.db, l.id, body.value) : await deleteListEntry(app.db, l.id, body.value)
        auditMutation(app, config, req, {
          action: 'list.entries.delete',
          severity: 'warning',
          targetType: 'app_resource',
          targetId: l.id,
          summary: `Удалена запись из списка: ${l.name}`,
          details: { list_id: l.id, value: body.value },
        })
        return summary ? result : mapListDetail(app.db, l.id)
      } catch (err) {
        throw new AppError(
          'VALIDATION_ERROR',
          err instanceof Error ? err.message : String(err),
          400,
        )
      }
    },
  )

  app.post<{ Params: { id: string } }>('/lists/:id/refresh', async (req) => {
    const l = repos.getIpList(app.db, req.params.id)
    await refreshIpList(app.db, req.params.id)
    const detail = mapListDetail(app.db, req.params.id)
    if (!detail) throw new AppError('NOT_FOUND', 'List not found', 404)
    auditMutation(app, config, req, {
      action: 'list.refresh',
      targetType: 'app_resource',
      targetId: req.params.id,
      summary: `Обновлён список: ${l?.name ?? req.params.id}`,
      details: { list_id: req.params.id },
    })
    return detail
  })

  app.delete<{ Params: { id: string } }>('/lists/:id', async (req) => {
    const l = repos.getIpList(app.db, req.params.id)
    try { repos.deleteIpList(app.db, req.params.id) } catch (err) {
      throw new AppError('CONFLICT', err instanceof Error ? err.message : 'List is in use', 409)
    }
    if (l) {
      auditMutation(app, config, req, {
        action: 'list.delete',
        severity: 'warning',
        targetType: 'app_resource',
        targetId: l.id,
        summary: `Список удалён: ${l.name}`,
        details: { list_id: l.id },
      })
    }
    return { ok: true }
  })
}